I have a '65 Angler 5 hp I just bought. Not sure how long it has been since it's seen the water. When I bought it the guy hooked up the gas and it started on the second pull in a trash can. I bought a new gas tank (3 gal) and hose, mixed it about 50:1 (with 91 octane), primed and choked it and it started on the second pull, ran for about 4 seconds and would not start again. Should i change the plugs? Clean the carb? Is 91 octane OK? I'm not real familiar with outboards so any advice would help...thanks.